WO2013036090A1 - Procédé pour émettre et recevoir un signal de référence propre à l'équipement utilisateur et appareil correspondant - Google Patents

Procédé pour émettre et recevoir un signal de référence propre à l'équipement utilisateur et appareil correspondant Download PDF

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Publication number
WO2013036090A1
WO2013036090A1 PCT/KR2012/007268 KR2012007268W WO2013036090A1 WO 2013036090 A1 WO2013036090 A1 WO 2013036090A1 KR 2012007268 W KR2012007268 W KR 2012007268W WO 2013036090 A1 WO2013036090 A1 WO 2013036090A1
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WIPO (PCT)
Prior art keywords
specific reference
reference signal
terminal
index
mapped
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PCT/KR2012/007268
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English (en)
Korean (ko)
Inventor
김동철
조한규
한승희
노민석
Original Assignee
엘지전자 주식회사
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Application filed by 엘지전자 주식회사 filed Critical 엘지전자 주식회사
Priority to US14/342,702 priority Critical patent/US9344247B2/en
Priority to KR1020147004156A priority patent/KR20140065392A/ko
Publication of WO2013036090A1 publication Critical patent/WO2013036090A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04J—MULTIPLEX COMMUNICATION
    • H04J11/00—Orthogonal multiplex systems, e.g. using WALSH codes
    • H04J11/0023—Interference mitigation or co-ordination
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H04L5/0051—Allocation of pilot signals, i.e. of signals known to the receiver of dedicated pilots, i.e. pilots destined for a single user or terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/24—Radio transmission systems, i.e. using radiation field for communication between two or more posts
    • H04B7/26—Radio transmission systems, i.e. using radiation field for communication between two or more posts at least one of which is mobile
    • H04B7/2603—Arrangements for wireless physical layer control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/022—Channel estimation of frequency response
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT
    • H04L5/001—Time-frequency the frequencies being orthogonal, e.g. OFDM(A), DMT the frequencies being arranged in component carriers

Definitions

  • the present invention relates to wireless communications, and more particularly, to a method and apparatus for transmitting and receiving a terminal-specific reference signal.
  • the LTE-A system which is the standard of the next generation mobile communication system, is expected to support CoMP (Coordinated Multi Point) and Multi User-MIMO (MU-MIMO) methods, which were not supported in the existing standard, to improve data rates.
  • the CoMP system refers to a system in which two or more base stations or cells cooperate with each other to communicate with the terminal in order to improve communication performance between the terminal and the base station (cell or sector) in the shadow area.
  • the CoMP scheme may be classified into joint MIMO-type joint processing (CoMP-JP: CoMP-Joint Processing) and cooperative scheduling / beamforming (CoMP-CS: CoMP-Coordinated Scheduling / beamforming) schemes through data sharing.
  • the terminal may simultaneously receive data from each base station performing CoMP at the same time, and combine the received signals from each base station to improve reception performance.
  • the terminal may receive data through one base station through beamforming instantaneously.
  • the base station allocates each antenna resource to another terminal, and selects and schedules a terminal capable of a high data rate for each antenna.
  • the MU-MIMO scheme is a technique for improving system throughput.
  • the next generation LTE-A system is designed to enable a large amount of data transmission.
  • the LTE-A system employs carrier aggregation (CA) technology, thereby aggregating a plurality of component carriers (CCs) to execute transmission, thereby improving transmission bandwidth of the terminal. Improve and increase the efficiency of use of the frequency.
  • LTE-A system can use a single carrier (single carrier) used in the existing LTE Rel-8 / 9 at the same time by using a plurality of carriers (ie multi-carrier) in a bundle, it is possible to extend the bandwidth to 100MHz.
  • the carrier defined as a component carrier (or element carrier) up to 20 MHz in the existing LTE LTE Rel-8 / 9, and up to five component carriers (CC) through a carrier aggregation technology
  • the terminal can be used.
  • the introduction of the CA scheme also introduces a new carrier type, and in a specific subframe of the new type of carrier, data may be loaded instead of control information at the beginning of the subframe.
  • a downlink control channel is located in front of a subframe, and a mapping pattern of a UE-specific reference signal has been proposed only in this case, and a downlink control channel is missing in front of a subframe and data is loaded in a corresponding region. No suggestions were made for.
  • An object of the present invention is to provide a method for transmitting a UE-specific reference signal by a base station in a wireless communication system.
  • Another object of the present invention is to provide a method for a UE to receive a UE-specific reference signal in a wireless communication system.
  • Another object of the present invention is to provide a base station for transmitting a UE-specific reference signal (UE-specific reference signal) in a wireless communication system.
  • UE-specific reference signal UE-specific reference signal
  • Another object of the present invention is to provide a terminal for receiving a UE-specific reference signal.
  • a base station transmits a UE-specific reference signal (UE-specific reference signal), the base station to the terminal-specific reference signal And transmitting to a terminal using a predetermined pattern, wherein the predetermined pattern includes symbol indexes 0, 3, in an even index slot in one resource block (RB).
  • the predetermined pattern is mapped to the RE corresponding to the index including the symbol indexes 2 and 5.
  • the predetermined pattern is usually applied to a subframe to which a normal cyclic prefix is applied.
  • the preset pattern may be mapped to subcarrier indices 1, 5, and 9 from among REs whose UE-specific reference signals correspond to indexes including the symbol indices 0, 3, and 6, or subcarriers. It may be mapped to subcarriers corresponding to indexes 3, 7, and 11.
  • a base station transmits a UE-specific reference signal (UE-specific reference signal), the base station is a terminal-specific reference signal
  • the method may include transmitting the symbol indexes 1 and 4 to each slot in one resource block (RB) by the UE-specific reference signal. It may be a pattern mapped to the RE corresponding to the included index.
  • the predetermined pattern may be applied to a subframe to which an extended cyclic prefix is applied.
  • the preset pattern may be mapped to subcarrier indexes 0, 3, 6, and 9, or subcarrier index 2, among the REs in which the UE-specific reference signal corresponds to an index including the symbol indices 1 and 4. , 5, 8, and 11 may be mapped to subcarriers.
  • a method for receiving a UE-specific reference signal (UE-specific reference signal), the terminal-specific reference signal from the base station in advance Receiving according to the determined pattern, wherein the predetermined pattern is an index comprising a symbol index 0, 3, 6 in the even-index slot in the terminal-specific reference signal is one resource block (RB) In an RE corresponding to and an odd index slot in the RB, a pattern is mapped to an RE corresponding to an index including symbol indices 2 and 5.
  • a method for receiving a UE-specific reference signal (UE-specific reference signal), the terminal-specific reference signal from the base station in advance Receiving according to the determined pattern, wherein the predetermined pattern corresponds to the index in which the terminal-specific reference signal includes symbol index 1, 4 per slot in one resource block (RB) This is the pattern mapped to the RE.
  • UE-specific reference signal UE-specific reference signal
  • RB resource block
  • a base station transmitting a UE-specific reference signal transmits the UE-specific reference signal to a terminal using a predetermined pattern.
  • the predetermined pattern may include a transmitter, wherein the terminal-specific reference signal is included in an RE corresponding to an index including symbol indices 0, 3, and 6 in even index slots in one resource block (RB).
  • the odd index slot in the RB may be a pattern mapped to an RE corresponding to an index including symbol indices 2 and 5.
  • a terminal for receiving a UE-specific reference signal may receive a terminal-specific reference signal from a base station according to a predetermined pattern.
  • the predetermined pattern includes a receiver in an RE corresponding to an index including symbol indices 0, 3, and 6 in an even index slot in one resource block (RB).
  • An odd index slot in the RB may be a pattern mapped to an RE corresponding to an index including symbol indices 2 and 5.
  • FIG. 1 is a block diagram illustrating the configuration of a base station 105 and a terminal 110 in a wireless communication system 100.
  • 2A is a diagram illustrating a structure of a radio frame used in a 3GPP LTE system as an example of a wireless communication system.
  • FIG. 2B is a diagram illustrating a type 2 frame structure (frame structure type 2) used in a 3GPP LTE system as an example of a wireless communication system.
  • 3A and 3B illustrate structures of downlink and uplink subframes of a 3GPP LTE system as an example of a mobile communication system.
  • FIG. 4 illustrates a downlink time-frequency resource grid structure in a 3GPP LTE system.
  • 5A and 5B illustrate the physical layer (first layer, L1) and MAC layer (second layer, L2) configuration of a multi-carrier support system.
  • FIG. 6 is a diagram illustrating physical channels used in a 3rd generation partnership project (3GPP) Long Term Evolution (LTE) system, which is an example of a wireless communication system, and a general signal transmission method using the same.
  • 3GPP 3rd generation partnership project
  • LTE Long Term Evolution
  • FIG. 7 is a diagram illustrating a CRS pattern in a 3GPP LTE system as an example of a wireless communication system.
  • 8A and 8B are diagrams illustrating an example of a time-frequency position in which a CSI-RS is transmitted in a 3GPP LTE and LTE-A system as an example of a wireless communication system.
  • FIG. 9 is a diagram illustrating a mapping pattern of a terminal-specific reference signal when normal CP is applied to antenna ports 7, 8, 9, and 10.
  • FIG. 9 is a diagram illustrating a mapping pattern of a terminal-specific reference signal when normal CP is applied to antenna ports 7, 8, 9, and 10.
  • FIG. 10 is a diagram illustrating a mapping pattern of a UE-specific reference signal when extended CP is applied to antenna ports 7, 8.
  • 11A to 11M illustrate mapping patterns of UE-specific reference signals for antenna port 5 when normal CP is applied according to an embodiment of the present invention.
  • 12A to 12K illustrate mapping patterns of UE-specific reference signals for antenna port 5 when extended CP is applied according to an embodiment of the present invention.
  • 13A to 13D illustrate UE-specific reference signal mapping patterns for antenna port 7 when the special subframe configuration 3, 4, or 8 to which normal CP is applied, respectively.
  • 14A to 14D illustrate UE-specific reference signal mapping patterns for antenna port 8 when the special subframe configuration 3, 4, or 8 to which normal CP is applied, respectively.
  • 15A to 15D show UE-specific reference signal mapping patterns for antenna port 9 in case of special subframe configuration 3, 4, or 8 to which normal CP is applied, respectively.
  • 16A to 16D illustrate UE-specific reference signal mapping patterns for antenna port 10 in the case of special subframe configuration 3, 4, or 8 to which normal CP is applied.
  • 17A to 17D illustrate UE-specific reference signal mapping patterns for antenna port 7 when the special subframe configuration 1, 2, 6, or 7 to which normal CP is applied, respectively.
  • 18A to 18D illustrate UE-specific reference signal mapping patterns for antenna port 8 in case of special subframe configuration 1, 2, 6, or 7 to which normal CP is applied.
  • 19A to 19D illustrate UE-specific RS mapping patterns for antenna port 9 in case of special subframe configuration 1, 2, 6, or 7 to which normal CP is applied.
  • 20A to 20D illustrate UE-specific RS mapping patterns for antenna port 10 in case of special subframe configuration 1, 2, 6, or 7 to which normal CP is applied.
  • 21A to 21E illustrate mapping patterns of UE-specific reference signals for antenna port 7 in the case of other downlink subframes except for the special subframe to which normal CP is applied.
  • 22A to 22E illustrate mapping patterns of UE-specific reference signals for antenna port 8 in the case of other downlink subframes except for the special subframe to which normal CP is applied.
  • 23A to 23E illustrate mapping patterns of UE-specific reference signals for antenna port 9 in the case of other downlink subframes except for the special subframe to which normal CP is applied.
  • 24A to 24E illustrate mapping patterns of UE-specific reference signals for antenna port 10 in the case of other downlink subframes except for the special subframe to which normal CP is applied.
  • 25A to 25G illustrate mapping patterns of UE-specific reference signals for antenna port 7 when the special subframe configuration 1, 2, 3, 5, or 6 to which extended CP is applied, respectively.
  • 26A to 26G illustrate mapping patterns of UE-specific reference signals for antenna port 8 in case of special subframe configuration 1, 2, 3, 5, or 6 to which extended CP is applied.
  • 27A to 27H illustrate mapping patterns of UE-specific reference signals for antenna port 7 in the case of all other downlink subframes to which extended CP is applied and except for a special subframe.
  • 28A to 28H illustrate mapping patterns of UE-specific reference signals for antenna port 8 in the case of all other downlink subframes to which extended CP is applied and except for the special subframe.
  • 29A to 29H illustrate CSI-RS mapping patterns for antenna ports in a downlink subframe to which extended CP is applied except for a special subframe.
  • a terminal collectively refers to a mobile or fixed user terminal device such as a user equipment (UE), a mobile station (MS), an advanced mobile station (AMS), a machine to machine (M2M) device, and the like.
  • the base station collectively refers to any node of the network side that communicates with the terminal such as a Node B, an eNode B, a Base Station, and an Access Point (AP).
  • the base station may be used as a concept including a cell, a sector, and the like.
  • a user equipment may receive information from a base station through downlink, and the terminal may also transmit information through uplink.
  • the information transmitted or received by the terminal includes data and various control information, and various physical channels exist according to the type and purpose of the information transmitted or received by the terminal.
  • CDMA code division multiple access
  • FDMA frequency division multiple access
  • TDMA time division multiple access
  • OFDMA orthogonal frequency division multiple access
  • SC-FDMA single carrier frequency division multiple access
  • CDMA may be implemented with a radio technology such as Universal Terrestrial Radio Access (UTRA) or CDMA2000.
  • TDMA may be implemented with wireless technologies such as Global System for Mobile communications (GSM) / General Packet Radio Service (GPRS) / Enhanced Data Rates for GSM Evolution (EDGE).
  • GSM Global System for Mobile communications
  • GPRS General Packet Radio Service
  • EDGE Enhanced Data Rates for GSM Evolution
  • OFDMA may be implemented in a wireless technology such as IEEE 802.11 (Wi-Fi), IEEE 802.16 (WiMAX), IEEE 802-20, Evolved UTRA (E-UTRA).
  • UTRA is part of the Universal Mobile Telecommunications System (UMTS).
  • 3rd Generation Partnership Project (3GPP) long term evolution (LTE) employs OFDMA in downlink and SC-FDMA in uplink as part of Evolved UMTS (E-UMTS) using E-UTRA.
  • LTE-A Advanced is an evolution of 3GPP LTE.
  • FIG. 1 is a block diagram showing the configuration of a base station 105 and a terminal 110 in a wireless communication system 100.
  • the wireless communication system 100 may include one or more base stations and / or one or more terminals. .
  • the base station 105 includes a transmit (Tx) data processor 115, a symbol modulator 120, a transmitter 125, a transmit / receive antenna 130, a processor 180, a memory 185, and a receiver ( 190, a symbol demodulator 195, and a receive data processor 197.
  • the terminal 110 transmits (Tx) the data processor 165, the symbol modulator 175, the transmitter 175, the transmit / receive antenna 135, the processor 155, the memory 160, the receiver 140, and the symbol. It may include a demodulator 155 and a receive data processor 150.
  • the base station 105 and the terminal 110 are provided with a plurality of transmit and receive antennas. Accordingly, the base station 105 and the terminal 110 according to the present invention support a multiple input multiple output (MIMO) system. In addition, the base station 105 according to the present invention may support both a single user-MIMO (SU-MIMO) and a multi-user-MIMO (MU-MIMO) scheme.
  • MIMO multiple input multiple output
  • SU-MIMO single user-MIMO
  • MU-MIMO multi-user-MIMO
  • the transmit data processor 115 receives the traffic data, formats the received traffic data, codes it, interleaves and modulates (or symbol maps) the coded traffic data, and modulates the symbols ("data"). Symbols ").
  • the symbol modulator 120 receives and processes these data symbols and pilot symbols to provide a stream of symbols.
  • the symbol modulator 120 multiplexes the data and pilot symbols and sends it to the transmitter 125.
  • each transmission symbol may be a data symbol, a pilot symbol, or a signal value of zero.
  • pilot symbols may be sent continuously.
  • the pilot symbols may be frequency division multiplexed (FDM), orthogonal frequency division multiplexed (OFDM), time division multiplexed (TDM), or code division multiplexed (CDM) symbols.
  • Transmitter 125 receives the stream of symbols and converts it into one or more analog signals, and further adjusts (eg, amplifies, filters, and frequency upconverts) the analog signals to provide a wireless channel. Generates a downlink signal suitable for transmission via the transmission antenna 130, the transmission antenna 130 transmits the generated downlink signal to the terminal.
  • the receiving antenna 135 receives the downlink signal from the base station and provides the received signal to the receiver 140.
  • Receiver 140 adjusts the received signal (eg, filtering, amplifying, and frequency downconverting), and digitizes the adjusted signal to obtain samples.
  • the symbol demodulator 145 demodulates the received pilot symbols and provides them to the processor 155 for channel estimation.
  • the symbol demodulator 145 receives a frequency response estimate for the downlink from the processor 155 and performs data demodulation on the received data symbols to obtain a data symbol estimate (which is an estimate of the transmitted data symbols). Obtain and provide data symbol estimates to a receive (Rx) data processor 150.
  • Receive data processor 150 demodulates (ie, symbol de-maps), deinterleaves, and decodes the data symbol estimates to recover the transmitted traffic data.
  • the processing by symbol demodulator 145 and receiving data processor 150 is complementary to the processing by symbol modulator 120 and transmitting data processor 115 at base station 105, respectively.
  • the terminal 110 is on the uplink, and the transmit data processor 165 processes the traffic data to provide data symbols.
  • the symbol modulator 170 may receive and multiplex data symbols, perform modulation, and provide a stream of symbols to the transmitter 175.
  • the transmitter 175 receives and processes a stream of symbols to generate an uplink signal.
  • the transmit antenna 135 transmits the generated uplink signal to the base station 105.
  • an uplink signal is received from the terminal 110 through the reception antenna 130, and the receiver 190 processes the received uplink signal to obtain samples.
  • the symbol demodulator 195 then processes these samples to provide received pilot symbols and data symbol estimates for the uplink.
  • the received data processor 197 processes the data symbol estimates to recover the traffic data transmitted from the terminal 110.
  • Processors 155 and 180 of the terminal 110 and the base station 105 respectively instruct (eg, control, coordinate, manage, etc.) operations at the terminal 110 and the base station 105, respectively.
  • Respective processors 155 and 180 may be connected to memory units 160 and 185 that store program codes and data.
  • the memory 160, 185 is coupled to the processor 180 to store the operating system, applications, and general files.
  • the processors 155 and 180 may also be referred to as controllers, microcontrollers, microprocessors, microcomputers, or the like.
  • the processors 155 and 180 may be implemented by hardware or firmware, software, or a combination thereof.
  • ASICs application specific integrated circuits
  • DSPs digital signal processors
  • DSPDs digital signal processing devices
  • PLDs programmable logic devices
  • FPGAs Field programmable gate arrays
  • the firmware or software may be configured to include a module, a procedure, or a function for performing the functions or operations of the present invention, and to perform the present invention.
  • the firmware or software configured to be may be provided in the processors 155 and 180 or stored in the memory 160 and 185 to be driven by the processors 155 and 180.
  • the layers of the air interface protocol between the terminal and the base station between the wireless communication system (network) are based on the lower three layers of the open system interconnection (OSI) model, which is well known in the communication system. ), And the third layer L3.
  • the physical layer belongs to the first layer and provides an information transmission service through a physical channel.
  • a Radio Resource Control (RRC) layer belongs to the third layer and provides control radio resources between the UE and the network.
  • the terminal and the base station may exchange RRC messages through the wireless communication network and the RRC layer.
  • 2A is a diagram illustrating a structure of a radio frame used in a 3GPP LTE system as an example of a wireless communication system.
  • one radio frame has a length of 10 ms (327200 Ts) and consists of 10 equally sized subframes.
  • Each subframe has a length of 1 ms and consists of two slots.
  • Each slot has a length of 0.5 ms (15360 Ts).
  • the slot includes a plurality of OFDM symbols or SC-FDMA symbols in the time domain and a plurality of resource blocks in the frequency domain.
  • one resource block includes 12 subcarriers x 7 (6) OFDM symbols or SC-FDMA (Single Carrier-Frequency Division Multiple Access) symbols.
  • Transmission time interval which is a unit time for transmitting data, may be determined in units of one or more subframes.
  • the structure of the above-described radio frame is only an example, and the number of subframes included in the radio frame or the number of slots included in the subframe, the number of OFDM symbols or SC-FDMA symbols included in the slot may be variously changed. have.
  • FIG. 2B is a diagram illustrating a type 2 frame structure (frame structure type 2) used in a 3GPP LTE system as an example of a wireless communication system.
  • one radio frame has a length of 10 ms (327200 Ts) and consists of 10 equally sized subframes.
  • Each subframe has a length of 1 ms and consists of two slots.
  • Each slot has a length of 0.5 ms (15360 Ts).
  • Each half frame includes five subframes, and a subframe labeled "D” is a subframe for downlink transmission, a subframe labeled "U” is a subframe for uplink transmission, and "S"
  • the indicated subframe is a special subframe including a downlink pilot time slot (DwPTS), a guard period (GP), and an uplink pilot time slot (UpPTS).
  • DwPTS is used for initial cell search, synchronization, or channel estimation at the terminal.
  • UpPTS is used for channel estimation at the base station and synchronization of uplink transmission of the terminal.
  • the guard period is a period for removing interference generated in the uplink due to the multipath delay of the downlink signal between the uplink and the downlink.
  • the special subframe S exists every half-frame, and in the case of 5ms downlink-uplink switch-point period, only the first half-frame exists.
  • Subframe indexes 0 and 5 and DwPTS are sections for downlink transmission only.
  • the subframe immediately following the UpPTS and the special subframe is always an interval for uplink transmission.
  • the UE may assume the same uplink-downlink configuration across all cells, and guard intervals of special subframes in different cells overlap at least 1456 Ts.
  • the structure of the radio frame is only an example, and the number of subframes included in the radio frame or the number of slots included in the subframe and the number of symbols included in the slot may be variously changed.
  • Table 1 shows the composition of special frames (length of DwPTS / GP / UpPTS).
  • Table 2 below shows an uplink-downlink configuration.
  • Uplink-downlink configurations in a type 2 frame structure in the 3GPP LTE system there are seven uplink-downlink configurations in a type 2 frame structure in the 3GPP LTE system. Each configuration may have a different position or number of downlink subframes, special frames, and uplink subframes.
  • various embodiments of the present invention will be described based on uplink-downlink configurations of the type 2 frame structure shown in Table 2.
  • 3A and 3B illustrate structures of downlink and uplink subframes of a 3GPP LTE system as an example of a mobile communication system.
  • one downlink subframe includes two slots in the time domain. Up to three OFDM symbols of the first slot in the downlink subframe are control regions to which control channels are allocated, and the remaining OFDM symbols are data regions to which a Physical Downlink Shared Channel (PDSCH) is allocated.
  • PDSCH Physical Downlink Shared Channel
  • Downlink control channels used in 3GPP LTE systems include a Physical Control Format Indicator Channel (PCFICH), a Physical Downlink Control Channel (PDCCH), and a Physical Hybrid-ARQ Indicator Channel (PHICH).
  • PCFICH Physical Control Format Indicator Channel
  • PDCH Physical Downlink Control Channel
  • PHICH Physical Hybrid-ARQ Indicator Channel
  • the PCFICH transmitted in the first OFDM symbol of the subframe carries information about the number of OFDM symbols (that is, the size of the control region) used for transmission of control channels in the subframe.
  • Control information transmitted through the PDCCH is called downlink control information (DCI).
  • DCI indicates uplink resource allocation information, downlink resource allocation information, and uplink transmission power control command for arbitrary UE groups.
  • the PHICH carries an ACK (Acknowledgement) / NACK (Negative Acknowledgement) signal for an uplink HARQ (Hybrid Automatic Repeat Request). That is, the ACK / NACK signal for the uplink data transmitted by the terminal is transmitted on the PHICH.
  • ACK Acknowledgement
  • NACK Negative Acknowledgement
  • the base station controls resource allocation and transmission format of PDSCH (also referred to as DL grant), resource allocation information of PUSCH (also referred to as UL grant) through PDCCH, and transmit power control for any terminal and individual terminals in a group.
  • a set of Control (TPC) commands and activation of Voice over Internet Protocol (VoIP) can be sent.
  • the base station may transmit a plurality of PDCCHs in the control region, and the terminal may monitor the plurality of PDCCHs.
  • the PDCCH consists of an aggregation of one or more consecutive Control Channel Elements (CCEs).
  • the base station may transmit the PDCCH configured with one or a plurality of consecutive CCEs through the control region after subblock interleaving.
  • CCE is a logical allocation unit used to provide a PDCCH with a coding rate according to a state of a radio channel.
  • the CCE corresponds to a plurality of resource element groups.
  • the format of the PDCCH and the number of possible bits of the PDCCH are determined by the correlation between the number of CCEs and the coding rate provided by the CCEs.
  • Control information transmitted by the base station through the PDCCH is called downlink control information (DCI).
  • DCI downlink control information
  • the base station may transmit control information transmitted through the PDCCH according to the DCI format shown in Table 3 below.
  • DCI format 0 indicates uplink resource allocation information
  • DCI formats 1 to 2 indicate downlink resource allocation information
  • DCI formats 3 and 3A control uplink transmission power for arbitrary UE groups.
  • DCI format 3 / 3A includes TPC commands for a plurality of terminals.
  • the base station masks the TPC-ID in the CRC.
  • the TPC-ID is an identifier that the terminal demasks to monitor the PDCCH carrying the TPC command.
  • the TPC-ID may be referred to as an identifier used by the UE to decode the PDCCH in order to confirm whether or not the TPC command is transmitted on the PDCCH.
  • TPC-IDs are existing identifiers such as Cell-Radio Network Temporary Identifier (C-RNTI), Paging Indication-Radio Network Temporary Identifier (PI-RNTI), SC-RNTI, (System Change-Radio Network Temporary Identifier), and RA-RNTI.
  • C-RNTI Cell-Radio Network Temporary Identifier
  • PI-RNTI Paging Indication-Radio Network Temporary Identifier
  • SC-RNTI System Change-Radio Network Temporary Identifier
  • RA-RNTI Random Access Radio Network Temporary Identifier
  • the TPC-ID differs from C-RNTI, which is an identifier for a specific terminal, in that it is an identifier for a specific set of terminals in a cell, and also different from PI-RNTI, SC-RNTI, and RA-RNTI, which is an identifier for all terminals in a cell. . This is because when the DCI includes TPC commands for N terminals, only the N terminals need to receive
  • the UE finds a TPC-ID by monitoring a set of PDCCH candidates in a search space in a subframe.
  • the TPC-ID may be found in the common search space or may be found in the UE sepcific search space.
  • the common search space is a search space searched by all terminals in a cell, and the terminal specific search space refers to a search space searched by a specific terminal. If the CRC error is not detected by demasking the TPC-ID from the corresponding PDCCH candidate, the UE may receive a TPC command on the PDCCH.
  • TPC-ID an identifier for the PDCCH carrying only a plurality of TPC commands
  • the base station may transmit scheduling assignment information and other control information through the PDCCH.
  • the physical control channel may be transmitted in one aggregation or a plurality of continuous control channel elements (CCEs).
  • CCEs continuous control channel elements
  • One CCE includes nine Resource Element Groups (REGs).
  • the number of RBGs not allocated to the Physical Control Format Indicator CHhannel (PCFICH) or the Physical Hybrid Automatic Repeat Request Indicator Channel (PHICH) is NREG.
  • the CCEs available in the system are from 0 to NCCE-1 (where to be).
  • the PDCCH supports multiple formats as shown in Table 4 below.
  • the base station may determine the PDCCH format according to how many areas, such as control information to send.
  • the UE may reduce overhead by reading control information in units of CCE.
  • an uplink subframe may be divided into a control region and a data region in the frequency domain.
  • the control region is allocated to a physical uplink control channel (PUCCH) that carries uplink control information.
  • the data area is allocated to a Physical Uplink Shared CHannel (PUSCH) for carrying user data.
  • PUCCH Physical Uplink Shared CHannel
  • PUSCH Physical Uplink Shared CHannel
  • PUCCH for one UE is allocated to an RB pair in one subframe. RBs belonging to the RB pair occupy different subcarriers in each of two slots. The RB pair assigned to the PUCCH is frequency hopped at the slot boundary.
  • FIG. 4 illustrates a downlink time-frequency resource grid structure in a 3GPP LTE system.
  • OFDM orthogonal frequency division multiplexing
  • the number of OFDM symbols included in one slot may vary depending on the length of a cyclic prefix (CP) and the interval of subcarriers.
  • CP cyclic prefix
  • one resource grid may be defined per one antenna port.
  • Each element in the resource grid for each antenna port is called a resource element (RE) and is uniquely identified by an index pair (k, l) in the slot.
  • k is the index in the frequency domain
  • l is the index in the time domain and k is 0, ...
  • Has a value of -1 and l is 0, ..., It has any one of -1.
  • the resource block shown in FIG. 4 is used to describe a mapping relationship between certain physical channels and resource elements.
  • the RB may be divided into a physical resource block (PRB) and a virtual resource block (VRB).
  • PRB physical resource block
  • VRB virtual resource block
  • the one PRB is a time domain Contiguous OFDM symbols and frequency domain It is defined as two consecutive subcarriers. here and May be a predetermined value. E.g and May be given as in Table 5 below. So one PRB ⁇ It consists of four resource elements.
  • One PRB may correspond to one slot in the time domain and 180 kHz in the frequency domain, but is not limited thereto.
  • PRB is at 0 in the frequency domain It has a value up to -1.
  • the size of the VRB is equal to the size of the PRB.
  • the VRB may be defined by being divided into a localized VRB (LVRB) and a distributed VRB (DVRB). For each type of VRB, a pair of VRBs in two slots in one subframe are assigned together a single VRB number n VRBs .
  • the VRB may have the same size as the PRB.
  • Two types of VRBs are defined, the first type being a localized VRB (LVRB) and the second type being a distributed VRB (DVRB).
  • LVRB localized VRB
  • DVRB distributed VRB
  • a pair of VRBs are allocated over two slots of one subframe with a single VRB index (hereinafter may also be referred to as VRB number).
  • VRB number belonging to the first slot of the two slots constituting one subframe VRBs from 0 each Is assigned an index of any one of -1, and belongs to the second one of the two slots VRBs likewise start with 0
  • the index of any one of -1 is allocated.
  • the base station determines the PDCCH format according to the downlink control information (DCI) transmitted to the terminal, and attaches a cyclic redundancy check (CRC) to the control information.
  • the CRC is masked with a unique identifier (referred to as RNTI (Radio Network Temporary Identifier)) according to the owner or purpose of the PDCCH.
  • RNTI Radio Network Temporary Identifier
  • the PDCCH is for a specific terminal, a unique identifier of the terminal, for example, a C-RNTI (Cell-RNTI) may be masked to the CRC.
  • a paging indication identifier for example, P-RNTI (Paging-RNTI) may be masked to the CRC.
  • the system information identifier SI-RNTI (system information-RNTI) may be masked to the CRC.
  • a random access-RNTI (RA-RNTI) may be masked to the CRC to indicate a random access response that is a response to the transmission of the random access preamble of the UE. Table 6 below shows examples of identifiers masked on the PDCCH.
  • the PDCCH carries control information for a corresponding specific terminal, and if another RNTI is used, the PDCCH carries common control information received by all or a plurality of terminals in a cell, respectively.
  • the base station performs channel coding on the DCI to which the CRC is added to generate coded data.
  • the base station performs rate matching according to the number of CCEs allocated to the PDCCH format.
  • the base station then modulates the encoded data to generate modulation symbols.
  • the base station maps modulation symbols to physical resource elements.
  • the 3rd Generation Partnership Project (3GPP) refers to the next generation wireless communication system of the LTE system as a Long Term Evolution-Advanced (LTE-A) system and is designed to enable high speed and large data transmission.
  • the LTE-A system employs carrier aggregation (CA) technology, thereby aggregating a plurality of component carriers (CCs) to execute transmission, thereby improving transmission bandwidth of the terminal. Improve and increase the efficiency of use of the frequency.
  • LTE-A system can use a single carrier (single carrier) used in the existing LTE Rel-8 / 9 at the same time by using a plurality of carriers (ie multi-carrier) in a bundle, it is possible to extend the bandwidth to 100MHz.
  • the carrier defined as a component carrier (or element carrier) up to 20 MHz in the existing LTE LTE Rel-8 / 9, and up to five component carriers (CC) through a carrier aggregation technology
  • the terminal can be used.
  • the number of carrier aggregations of the uplink and the downlink may be different. If it is to be compatible with the previous system, the uplink and the downlink may configure the same number of component carriers.
  • a different amount of component carriers may be configured for uplink / downlink to obtain different transmission bandwidths.
  • each component carrier independently transmits one transport block, and is provided with an independent hybrid automatic repeat reQuest (HARQ) mechanism.
  • HARQ hybrid automatic repeat reQuest
  • carrier aggregation using a plurality of component carriers requires a method of effectively managing component carriers.
  • component carriers may be classified according to roles and features.
  • the component carrier may be divided into a primary component carrier (PCC) and a secondary component carrier (SCC).
  • PCC primary component carrier
  • SCC secondary component carrier
  • a primary component carrier (PCC) is defined as one component carrier for each terminal as a component carrier which is the center of management of the component carrier when using multiple component carriers.
  • Such a main component carrier (PCC) may be referred to as a primary cell (Pcell) or the like.
  • the secondary component carrier may be referred to as a secondary cell (Scell) or the like.
  • the primary component carrier may serve as a core carrier for managing the aggregated total component carriers, and the remaining secondary component carriers may play a role of providing additional frequency resources to provide a high data rate.
  • the base station may be connected through the primary component carrier (RRC) for signaling with the terminal. Provision of information for security and higher layers may also be made through the primary component carrier.
  • RRC primary component carrier
  • Provision of information for security and higher layers may also be made through the primary component carrier.
  • the corresponding component carrier will be the main component carrier, and in this case, it can play the same role as the carrier of the existing LTE system.
  • the downlink resource may be a component carrier (DL CC), and the uplink resource may be defined as a UL CC.
  • DL CC component carrier
  • UL CC uplink resource
  • a combination of downlink resources and uplink resources may be referred to as a cell.
  • the cell may refer to only the DL CC (or UL CC).
  • one serving cell is configured (configured serving cell) in a specific terminal, it has 1 DL CC and 1 UL CC.
  • a specific UE when it receives two or more serving cells, it may have as many DL CCs as the number of cells, and the number of UL CCs may be equal to or smaller than the number of DL CCs. Or, if a specific UE receives a plurality of serving cells, a CA environment with more UL CCs than the number of DL CCs may be supported.
  • the linkage between the carrier frequency (cell center frequency) of the downlink resource and the carrier frequency of the uplink resource may be indicated by system information (SI) transmitted on the downlink resource.
  • SI system information
  • a combination of DL resources and UL resources may be configured by linkage defined by System Information Block Type 2 (SIB2).
  • carrier aggregation may be referred to as a merge of two or more cells having different carrier frequencies. That is, a case where a specific terminal receives two or more serving cells having different carrier frequencies may be referred to as a CA environment.
  • CA carrier aggregation
  • SCells Secondary cells
  • PCell Primary Cell
  • the serving cell may be a PCell or an SCell. If the RRC connection (RRC_CONNECTED) terminal does not support CA, only one serving cell including the PCell exists. Alternatively, when the RRC_CONNECTED terminal supports CA, the term serving cell refers to a set of one or more cells including a PCell and a SCell.
  • PCell is a cell which is the center of control related communication among serving cells configured in CA environment.
  • the cell may be a PCell indicated or used in an initial connection establishment procedure, a connection re-establishment procedure, or a handover procedure.
  • the terminal may receive important control information (eg, PUCCH) through its PCell, and the terminal may also perform monitoring procedures for acquiring and changing system information only in the PCell. However, in some cases, the terminal may receive control information through the Scell.
  • the base station may change the PCell only through a handover procedure using an RRCConnectionReconfiguration message including mobilityControlInfo.
  • SCell refers to the remaining cells other than the PCell among the serving cells configured in the CA environment. There is no PUCCH in SCell.
  • the base station may provide all system information related to the operation of the corresponding cell in the RRC_CONNECTED state to the terminal supporting the CA through dedicated signaling.
  • the change of the system information may be performed by releasing and adding the corresponding SCell through one RRCConnectionReconfiguration message.
  • the base station may transmit dedicated signaling having parameters different from the parameters included in the broadcast message in the corresponding SCell to the terminal.
  • the base station may configure one or more SCells in addition to the PCell (a cell set as the serving cell during the connection establishment procedure) to the terminal.
  • the PCell is used to provide secure input and higher layer system information, and the SCell can be used to provide additional downlink resources and, if necessary, to provide uplink resources.
  • the base station may independently add, remove or modify the SCell through the RRC connection reconfiguration procedure using the RRCConnectionReconfiguration message with or without mobilityControlInfo.
  • PCell and SCell which are UE-specific parameters.
  • a specific terminal may have one or more configured serving cells. If a plurality of configured serving cells exist, a cell becomes a PCell among the cells, and the remaining cells become SCells.
  • the PCell may be set to a cell having the lowest index among cell indices (eg, ServCellIndex).
  • a UL-DL configuration (UL-DL) defining which UL subframe is transmitted through ACK / NACK for a PDSCH transmitted in a specific DL subframe. configuration may be the same in all cells.
  • the UE is a base station in a predetermined CC CC uplink control information such as Channel State Information (CSI) (CQI, RI, PMI, etc.) measured from one or more CCs, HARQ ACK / NACK Can be sent.
  • CSI Channel State Information
  • the UE collects a plurality of ACK / NACK information received from the PCell DL CC and the SCell (s) DL CC (eg, ACK / NACK multiplexing or ACK / NACK bundling, etc.).
  • the UL CC in the PCell may transmit using one PUCCH.
  • 5A and 5B illustrate the physical layer (first layer, L1) and MAC layer (second layer, L2) configuration of a multi-carrier support system.
  • a base station of an existing wireless communication system supporting a single carrier has one physical layer (PHY) entity supporting one carrier and one medium access control (MAC) entity controlling one PHY entity.
  • PHY physical layer
  • MAC medium access control
  • a baseband processing operation can be performed.
  • an L1 / L2 scheduler operation including a MAC protocol data unit (PDU) generation and a MAC / RLC sublayer may be performed at a transmitter.
  • the MAC PDU packet block of the MAC layer is converted into a transport block through a logical transport layer and mapped to a physical layer input information block.
  • the MAC layer of this figure may be expressed as an entire L2 layer and applied as a meaning encompassing MAC / RLC / PDCP sublayers. This application specifies that all of the MAC layer descriptions throughout the present invention may be substituted.
  • a plurality of MAC-PHY entities may be provided in a multicarrier support system. That is, as shown in FIG. 5A, a transmitter and a receiver of the multicarrier support system may be configured in a form in which one MAC-PHY entity corresponds to each of n component carriers. Since an independent PHY layer and a MAC layer are configured for each component carrier, a PDSCH is generated for each component carrier in the physical layer from the MAC PDU.
  • the multicarrier support system may be configured as one common MAC entity and a plurality of PHY entities. That is, as shown in FIG. 5B, n PHY entities corresponding to each of the n component carriers are provided, and a transmitter and a receiver of the multicarrier support system are configured such that there is one common MAC entity controlling the n PHY entities. It may be.
  • MAC PDUs from one MAC layer may be divided into a plurality of transport blocks corresponding to each of a plurality of component carriers on the transport layer.
  • each component carrier may be branched. Accordingly, PDSCH is generated for each component carrier in the physical layer.
  • FIG. 6 is a diagram illustrating physical channels used in a 3rd generation partnership project (3GPP) Long Term Evolution (LTE) system, which is an example of a wireless communication system, and a general signal transmission method using the same.
  • 3GPP 3rd generation partnership project
  • LTE Long Term Evolution
  • the user equipment which is powered on again or enters a new cell while the power is turned off performs an initial cell search operation such as synchronizing with the base station in step S101.
  • the user equipment may receive a Primary Synchronization Channel (P-SCH) and a Secondary Synchronization Channel (S-SCH) from the base station to synchronize with the base station and obtain information such as a cell ID. have. Thereafter, the user equipment may receive a physical broadcast channel from the base station to obtain broadcast information in a cell. Meanwhile, the user equipment may receive a downlink reference signal (DL RS) in the initial cell search step to check the downlink channel state.
  • P-SCH Primary Synchronization Channel
  • S-SCH Secondary Synchronization Channel
  • DL RS downlink reference signal
  • the user equipment After the initial cell search, the user equipment receives a physical downlink control channel (PDCCH) and a physical downlink control channel (PDSCH) according to the physical downlink control channel information in step S102. More specific system information can be obtained.
  • PDCCH physical downlink control channel
  • PDSCH physical downlink control channel
  • the user equipment may perform a random access procedure such as step S103 to step S106 to the base station.
  • the user equipment may transmit the feature sequence as a preamble through a physical random access channel (PRACH) (S103) and receive a response message for the random access through the PDCCH and the corresponding PDSCH.
  • PRACH physical random access channel
  • S104 contention resolution procedures
  • transmission of an additional physical random access channel (S105) and reception of a physical downlink control channel / physical downlink shared channel (S106) are performed. Resolution Procedure).
  • the user equipment which has performed the above-described procedure is then subjected to a physical downlink control channel / physical downlink shared channel (S107) and a physical uplink shared channel (PUSCH) as a general uplink / downlink signal transmission procedure.
  • / Physical Uplink Control Channel (PUCCH) transmission (S108) can be performed.
  • the control information transmitted by the user equipment to the base station through the uplink or received by the user equipment from the base station includes a downlink / uplink ACK / NACK signal, a channel quality indicator (CQI) / precoding matrix index (PMI) / Rank (Rank). Indicators).
  • CQI channel quality indicator
  • PMI precoding matrix index
  • Rank Rank
  • Indicators Indicators.
  • the user equipment may transmit control information such as the above-described CQI / PMI / RI through the PUSCH and / or the PUCCH.
  • a reference signal can be classified into two types according to its purpose.
  • Reference signals include those used for channel information acquisition and data demodulation.
  • the UE since the UE can acquire downlink channel information, it needs to be transmitted over a wide band, and even a UE that does not receive downlink data in a specific subframe can receive and measure the reference signal.
  • the channel measurement reference signal may be used for the measurement of handover.
  • the latter is a reference signal transmitted together with a corresponding resource when the base station transmits a downlink signal, and the terminal can estimate the channel by receiving the reference signal, and thus can demodulate the data.
  • Such a demodulation reference signal should be transmitted to an area where data is transmitted.
  • CRS common reference signal
  • DRS data demodulation
  • UE-specific reference signals are used only for data demodulation
  • CRS is used for both purposes of channel information acquisition and data demodulation.
  • This CRS is a cell-specific reference signal, and the base station transmits the CRS every subframe over a wide band.
  • reference signals for up to four antenna ports are transmitted according to the number of transmit antennas of a base station. For example, if the number of transmit antennas of the base station is two, CRSs for antenna ports 0 and 1 are transmitted, and for four antennas, CRSs for antenna ports 0 to 3 are transmitted.
  • the CRS pattern in one resource block (RB) is shown in FIG. 7.
  • FIG. 7 is a diagram illustrating a CRS pattern in a 3GPP LTE system as an example of a wireless communication system.
  • CRSs (R0, R1, R2, and R3) for four antenna ports are allocated such that time-frequency resources do not overlap at 1RB.
  • a CRS When a CRS is mapped to a time-frequency resource in an LTE system, a reference signal for one antenna port on a frequency axis is mapped and transmitted to one RE per 6 REs. Since one RB consists of 12 REs on the frequency axis, two REs per RB are used for one antenna port.
  • FIG. 7B shows a pattern in which R0, which is a reference signal for antenna O number 0, is within 1 RB.
  • the base station In the LTE-A system, an evolution of the LTE system, the base station should be designed to support up to eight transmit antennas for downlink transmission. Therefore, reference signals for up to eight transmit antennas must also be supported. In the LTE system, since downlink reference signals are defined only for reference signals for up to four antenna ports, when the base station has four or more up to eight downlink transmission antennas in the LTE-A system, reference signals for these antenna ports are It must be additionally defined and designed. As reference signals for up to eight transmit antenna ports, both the reference signal for channel measurement and the reference signal for data demodulation have to be designed.
  • the LTE terminal must work well in the LTE-A system, and the system must support this. From the point of view of the reference signal transmission, it is necessary to additionally define a reference signal for up to eight transmit antenna ports in the time-frequency domain in which the CRS defined in LTE is transmitted every subframe over the entire band.
  • the reference signal patterns for up to eight transmit antennas are added to all bands in every subframe in the same manner as in the CRS of the existing LTE system, the overhead due to the reference signal transmission becomes excessively large.
  • the reference signal newly designed in the LTE-A system is divided into two categories, a channel for selecting a modulation and coding scheme (MCS) and a precoding matrix index (PMI).
  • MCS modulation and coding scheme
  • PMI precoding matrix index
  • Reference signal for data demodulation (Channel State Information-Reference Signal, CSI-RS (hereafter referred to as CSI-RS)) and eight transmit antennas for measurement purposes (Data deModulation-Reference Signal, DM-RS) (Hereinafter referred to as DM-RS or DMRS).
  • CSI-RS Channel State Information-Reference Signal
  • DM-RS Data deModulation-Reference Signal
  • the CSI-RS for the purpose of channel measurement is characterized in that it is designed for channel measurement-oriented purposes, unlike the conventional CRS is used for data demodulation at the same time as the channel measurement, handover, and the like.
  • the CSI-RS can also be used for the purpose of measuring handover and the like. Since the CSI-RS is transmitted only for obtaining the channel state information, unlike the CRS, the CSI-RS does not need to be transmitted every subframe. Accordingly, in order to reduce overhead due to CSI-RS transmission, the base station intermittently transmits the CSI-RS on the time axis, and decodes the DM-RS dedicated to the UE scheduled in the corresponding time-frequency domain for data demodulation. send. That is, the DM-RS of a specific terminal is transmitted only in a scheduled region, that is, a time-frequency region capable of receiving data.
  • a base station can transmit CSI-RS for all antenna ports. Since the base station transmits CSI-RS for up to eight transmit antenna ports every subframe, there is a problem of too much overhead.
  • the base station can reduce overhead by transmitting the CSI-RS intermittently on the time axis without transmitting every subframe. That is, the base station can transmit the CSI-RS periodically with a period of an integer multiple of one subframe or in a specific transmission pattern. At this time, the base station may configure the transmission period or pattern of the CSI-RS and inform the terminal.
  • the UE In order to measure the CSI-RS, the UE must know information about the CSI-RS time-frequency position, CSI-RS sequence, and CSI-RS frequency shift for each antenna port of the cell to which the UE belongs. There is. Since the CSI-RS is transmitted for the purpose of knowing downlink channel information, unlike the DRS, the CSI-RS should be transmitted over the entire band.
  • the terminal feeds back channel information such as CQI, PMI, and rank of each band to the base station by using the received CSI-RS, and the base station performs a scheduling operation by using the received channel information.
  • transmitting the CSI-RS for the LTE-A terminal to the LTE terminal may be overhead. The reason is that the LTE terminal does not know the existence of the CSI-RS and the base station punctures the corresponding REs when the CSI-RS is transmitted in the scheduling resource region to the LTE terminal.
  • 8A and 8B are diagrams illustrating an example of a time-frequency position in which a CSI-RS is transmitted in a 3GPP LTE and LTE-A system as an example of a wireless communication system.
  • UE-specific reference signals eg DeModulation Reference Signal, DMRS
  • DMRS DeModulation Reference Signal
  • ⁇ is the number of layers used for transmission of the PDSCH
  • the UE-specific reference signal exists only when the PDSCH transmission is associated with the corresponding antenna port, and thus becomes a valid reference signal for PDSCH demodulation.
  • UE-specific signals are transmitted only in resource blocks to which the corresponding PDSCH is mapped.
  • the terminal-specific signal is a signal on a physical signal or physical channels. In either case it is not sent in the resource element (k, l).
  • Terminal-specific reference signal sequence for antenna port 5 May be defined as Equation 1 below.
  • Equation 1 UE specific reference signal for antenna port 5 Has a value between -1 and 1 by the difference of c (2m) or c (2m + 1) and one. Also, By, it is possible to obtain a QPSK normalization value according to the average power value.
  • Equation 1 Is a pseudo-random sequence that is a PN sequence and may be defined by a Gold sequence of length-31.
  • Equation 2 is a gold sequence An example is shown.
  • Equation 3 Is a pseudo-random sequence that is a PN sequence and may be defined by a Gold sequence of length-31.
  • Equation 4 is a gold sequence An example is shown.
  • Cint is the initial sequence, Is the slot number in one radio frame, Is the cell identifier, Is given as a scrambling identitu field according to Table 7 below. If there is no DCI format 2B or 2C associated with PDSCH transmission on antenna ports 7 or 8, the UE Assume this is 0. For antenna ports 9 to 14, the terminal Assume this is 0.
  • the horizontal axis represents a time axis and the symbol l represents a symbol index in units of slots.
  • the symbol index in the slot unit is referred to in order of 0, 1, 2, ... from the left in the slot.
  • the vertical axis represents a frequency axis and represents a subcarrier, and the subcarrier indices may be referred to as 0, 1, 2,..., 11 from above.
  • 8A and 8B illustrate the mapping pattern of the UE-specific reference signal for antenna port 5 in units of RBs when a normal cyclic prefix (normal CP) and extended cyclic prefix (extended CP) are applied.
  • an RE mapped to R 5 corresponds to an RE to which a UE-specific reference signal for antenna port 5 is mapped.
  • the UE-specific reference signal for antenna port 5 may be an even-number slot (eg, slot 0) and an odd-slot (odd).
  • Contains the second, sixth, and tenth subcarriers (for example, subcarrier indexes 1, 5, and 9).
  • the odd-number slot for example, slot 1
  • FIG. 9 is a diagram illustrating a mapping pattern of a terminal-specific reference signal when normal CP is applied to antenna ports 7, 8, 9, and 10.
  • FIG. 9 is a diagram illustrating a mapping pattern of a terminal-specific reference signal when normal CP is applied to antenna ports 7, 8, 9, and 10.
  • REs denoted by R 7 , R 8 , R 9 , and R 10 indicate REs to which terminal-specific reference signals are mapped to antenna ports 7, 8, 9, and 10, respectively.
  • UE-specific reference signals for antenna ports 7, 8, 9, and 10 corresponding to the case of the special subframe configurations 1,2, 6, or 7 illustrate mapping patterns.
  • UE-specific reference signals for antenna ports 7, 8, 9, and 10 corresponding to the case of special subframe configuration 3, 4, or 8 illustrate mapping patterns.
  • UE-specific reference signals for antenna ports 7, 8, 9, and 10 show mapping patterns in the case of all other downlink subframes except the special subframe.
  • the mapping patterns of the terminal-specific reference signals shown at the top, the middle, and the bottom are arranged not to overlap each other.
  • FIG. 10 is a diagram illustrating a mapping pattern of a UE-specific reference signal when extended CP is applied to antenna ports 7, 8.
  • REs denoted by R 7 and R 8 indicate REs to which terminal-specific reference signals for antenna ports 7 and 8 are mapped.
  • the UE-specific reference signals for antenna ports 7, 8 corresponding to the case of the special subframe configurations 1,2, 3, 5, or 6 illustrate mapping patterns.
  • UE-specific reference signals for antenna ports 7, 8 illustrate mapping patterns in the case of all other downlink subframes except the special subframe.
  • downlink control information eg, PDCCH
  • PDCCH Physical Downlink Control Channel
  • Terminal-specific reference signals have also been designed with this in mind. However, if the downlink control information is missing and data is loaded in the corresponding area, the structure is degraded for the data. Therefore, a new terminal-specific reference signal pattern is needed to overcome this problem.
  • the present invention proposes a mapping pattern of a UE-specific reference signal in consideration of a situation in which a downlink control channel located at the front of a subframe is lost and data is loaded in a corresponding region. You can do it by designing while maintaining it and by increasing it.
  • a mapping pattern of a UE-specific reference signal is designed in units of resource blocks (RBs) in time and frequency domains, which can be extended and applied to the entire system bandwidth.
  • RBs resource blocks
  • the design for each antenna port is not limited to this, but antenna port mapping may be reset as necessary.
  • the terminal-specific reference signal pattern shown in the following figure can be used without an antenna port.
  • a sequence carried in the UE-specific reference signal designed in the following drawings may be reused by using the equations described in Equations 1 to 4 as described above or expanding.
  • new sequence generation equations can be designed and used.
  • 11A to 11M illustrate mapping patterns of UE-specific reference signals for antenna port 5 when normal CP is applied according to an embodiment of the present invention.
  • an RE denoted by R 5 is an RE to which a UE-specific reference signal for antenna port 5 is mapped.
  • a UE-specific reference signal may be mapped to an RE corresponding to an index of two or three symbols per slot, and a UE-specific reference to an RE corresponding to a subcarrier index of 3 on the frequency axis. Signals can be mapped.
  • 12A to 12K illustrate mapping patterns of UE-specific reference signals for antenna port 5 when extended CP is applied according to an embodiment of the present invention.
  • a UE-specific reference signal may be mapped to an RE corresponding to an index of three or four symbols in two slots, and 2 on a frequency axis.
  • the UE-specific reference signal may be mapped to an RE corresponding to four or four subcarrier indexes.
  • the numbers 0, 1, 2, 3, 4, 5, and 6 indicated on the time axis, which are horizontal axes, are OFDM symbol indexes.
  • one grid corresponds to an RE and may be represented by a subcarrier index and a symbol index (k, l).
  • 13A to 13D illustrate UE-specific reference signal mapping patterns for antenna port 7 when the special subframe configuration 3, 4, or 8 to which normal CP is applied, respectively.
  • an RE denoted by R 7 is an RE to which a UE-specific reference signal for antenna port 7 is mapped.
  • a UE-specific reference signal may be mapped to an RE corresponding to two symbol indices for each slot on the time axis. In the frequency axis, the UE-specific reference signal may be mapped to an RE corresponding to three subcarrier indices.
  • 14A to 14D illustrate UE-specific reference signal mapping patterns for antenna port 8 when the special subframe configuration 3, 4, or 8 to which normal CP is applied, respectively.
  • an RE denoted by R 8 is an RE to which a terminal-specific reference signal for antenna port 8 is mapped.
  • a UE-specific reference signal may be mapped to an RE corresponding to two symbol indices for each slot on the time axis. In the frequency axis, the UE-specific reference signal may be mapped to an RE corresponding to three subcarrier indices.
  • 15A to 15D show UE-specific reference signal mapping patterns for antenna port 9 in case of special subframe configuration 3, 4, or 8 to which normal CP is applied, respectively.
  • an RE denoted by R 9 is an RE to which a UE-specific reference signal for antenna port 9 is mapped.
  • a UE-specific reference signal may be mapped to an RE corresponding to two symbol indices for each slot on the time axis.
  • the UE-specific reference signal may be mapped to an RE corresponding to three subcarrier indices.
  • 16A to 16D illustrate UE-specific reference signal mapping patterns for antenna port 10 in the case of special subframe configuration 3, 4, or 8 to which normal CP is applied.
  • an RE denoted by R 10 is an RE to which a UE-specific reference signal for antenna port 10 is mapped.
  • a UE-specific reference signal may be mapped to an RE corresponding to two symbol indices for each slot on the time axis.
  • the UE-specific reference signal may be mapped to an RE corresponding to three subcarrier indices.
  • 17A to 17D illustrate UE-specific reference signal mapping patterns for antenna port 7 when the special subframe configuration 1, 2, 6, or 7 to which normal CP is applied, respectively.
  • the RE indicated by R 7 in FIG. 17 is a RE to which a UE-specific reference signal for antenna port 7 is mapped.
  • a UE-specific reference signal may be mapped to an RE corresponding to two symbol indices for each slot on the time axis.
  • the UE-specific reference signal may be mapped to an RE corresponding to three subcarrier indices.
  • 18A to 18D illustrate UE-specific reference signal mapping patterns for antenna port 8 in case of special subframe configuration 1, 2, 6, or 7 to which normal CP is applied.
  • the RE indicated by R 8 in FIG. 18 is a RE to which a UE-specific reference signal for antenna port 7 is mapped.
  • a UE-specific reference signal may be mapped to an RE corresponding to two symbol indices for each slot on the time axis.
  • the UE-specific reference signal may be mapped to an RE corresponding to three subcarrier indices.
  • 19A to 19D illustrate UE-specific RS mapping patterns for antenna port 9 in case of special subframe configuration 1, 2, 6, or 7 to which normal CP is applied.
  • an RE denoted by R 9 in FIG. 19 is an RE to which a UE-specific reference signal for antenna port 9 is mapped.
  • a UE-specific reference signal may be mapped to an RE corresponding to two symbol indices for each slot on the time axis.
  • the UE-specific reference signal may be mapped to an RE corresponding to three subcarrier indices.
  • 20A to 20D illustrate UE-specific RS mapping patterns for antenna port 10 in case of special subframe configuration 1, 2, 6, or 7 to which normal CP is applied.
  • an RE indicated by R 10 in FIG. 20 is an RE to which a UE-specific reference signal for antenna port 9 is mapped.
  • a UE-specific reference signal may be mapped to an RE corresponding to two symbol indices for each slot on the time axis.
  • the UE-specific reference signal may be mapped to an RE corresponding to three subcarrier indices.
  • mapping pattern of the UE-specific reference signal when the normal CP and the extended CP are applied for each special subframe configuration index has been described.
  • all other downlink subframes except the special subframe are proposed, and a mapping pattern of the UE-specific reference signal for antenna port 7 when the normal CP is applied.
  • 21A to 21E illustrate mapping patterns of UE-specific reference signals for antenna port 7 in the case of other downlink subframes except for the special subframe to which normal CP is applied.
  • an RE denoted by R 7 is an RE to which a UE-specific reference signal for antenna port 7 is mapped.
  • a UE-specific reference signal may be mapped to an RE corresponding to two symbol indices for each slot on the time axis, and UE-specific to an RE corresponding to three subcarrier indices on a frequency axis. Reference signals may be mapped.
  • 21B to 21E UE-specific reference signals may be mapped to REs corresponding to three symbol indices for each slot on the time axis, and UE-specific reference signals may be mapped to REs corresponding to three subcarrier indices on the frequency axis. Can be mapped.
  • 22A to 22E illustrate mapping patterns of UE-specific reference signals for antenna port 8 in the case of other downlink subframes except for the special subframe to which normal CP is applied.
  • an RE denoted by R 8 is an RE to which a UE-specific reference signal for antenna port 8 is mapped.
  • the UE-specific reference signal may be mapped to an RE corresponding to two symbol indices for each slot on the time axis, and the UE-specific reference signal may be mapped to an RE corresponding to three subcarrier indices on the frequency axis. Reference signals may be mapped. 22B to 22E, UE-specific RSs may be mapped to REs corresponding to three symbol indices in each slot on the time axis, and UE-specific RSs may be mapped to REs corresponding to three subcarrier indices on the frequency axis. Can be mapped.
  • 23A to 23E illustrate mapping patterns of UE-specific reference signals for antenna port 9 in the case of other downlink subframes except for the special subframe to which normal CP is applied.
  • an RE denoted by R 9 is an RE to which a terminal-specific reference signal for antenna port 9 is mapped.
  • a UE-specific reference signal may be mapped to an RE corresponding to two symbol indices for each slot on the time axis, and UE-specific to an RE corresponding to three subcarrier indices on the frequency axis. Reference signals may be mapped.
  • 23B to 23E UE-specific RSs may be mapped to REs corresponding to three symbol indices for each slot on the time axis, and UE-specific RSs may be mapped to REs corresponding to three subcarrier indices on the frequency axis. Can be mapped.
  • 24A to 24E illustrate mapping patterns of UE-specific reference signals for antenna port 10 in the case of other downlink subframes except for the special subframe to which normal CP is applied.
  • an RE denoted by R 10 is an RE to which a UE-specific reference signal for antenna port 10 is mapped.
  • a UE-specific reference signal may be mapped to an RE corresponding to two symbol indices for each slot on the time axis, and UE-specific to an RE corresponding to three subcarrier indices on the frequency axis. Reference signals may be mapped.
  • a UE-specific reference signal may be mapped to an RE corresponding to three symbol indices in each slot on the time axis, and a UE-specific reference signal may be mapped to an RE corresponding to three subcarrier indices on a frequency axis. Can be mapped.
  • 25A to 25G illustrate mapping patterns of UE-specific reference signals for antenna port 7 when the special subframe configuration 1, 2, 3, 5, or 6 to which extended CP is applied, respectively.
  • an RE denoted by R 7 is an RE to which a UE-specific reference signal for antenna port 7 is mapped.
  • UE-specific RSs may be mapped only in even slots. That is, the UE-specific reference signal may be mapped to an RE corresponding to four symbol indices only in even slots, and the UE-specific reference signal may be mapped to an RE corresponding to four subcarrier indices on a frequency axis.
  • the UE-specific reference signal may be mapped to an RE corresponding to two symbol indices for each slot on the time axis, and the UE-specific reference to an RE corresponding to four subcarrier indices on the frequency axis. Signals can be mapped.
  • 26A to 26G illustrate mapping patterns of UE-specific reference signals for antenna port 8 in case of special subframe configuration 1, 2, 3, 5, or 6 to which extended CP is applied.
  • an RE denoted by R 8 is an RE to which a terminal-specific reference signal for antenna port 8 is mapped.
  • UE-specific RSs may be mapped only in even slots. That is, the UE-specific reference signal may be mapped to an RE corresponding to four symbol indices only in even slots, and the UE-specific reference signal may be mapped to an RE corresponding to four subcarrier indices on a frequency axis.
  • the UE-specific reference signal may be mapped to an RE corresponding to three symbol indexes in an even index slot, and the UE-specific reference signal may be mapped to an RE corresponding to one symbol index in an odd index slot. Can be mapped.
  • a UE-specific reference signal may be mapped to an RE corresponding to four subcarrier indexes.
  • the UE-specific reference signal may be mapped to an RE corresponding to two symbol indices for each slot on the time axis, and the UE may be mapped to an RE corresponding to four subcarrier indices on the frequency axis. Specific reference signals may be mapped.
  • 27A to 27H illustrate mapping patterns of UE-specific reference signals for antenna port 7 in the case of all other downlink subframes to which extended CP is applied and except for a special subframe.
  • an RE denoted by R 7 is an RE to which a UE-specific reference signal for antenna port 7 is mapped.
  • a UE-specific reference signal may be mapped to an RE corresponding to two symbol indices in each slot.
  • a UE-specific reference signal may be mapped to an RE corresponding to four subcarrier indexes.
  • the UE-specific reference signal may be mapped to an RE corresponding to three symbol indices for each slot on the time axis, and the UE-specific reference to an RE corresponding to four subcarrier indices on the frequency axis. Signals can be mapped.
  • 28A to 28H illustrate mapping patterns of UE-specific reference signals for antenna port 8 in the case of all other downlink subframes to which extended CP is applied and except for the special subframe.
  • an RE denoted by R 7 is an RE to which a UE-specific reference signal for antenna port 7 is mapped.
  • a UE-specific reference signal may be mapped to an RE corresponding to two symbol indices in each slot.
  • a UE-specific reference signal may be mapped to an RE corresponding to four subcarrier indexes.
  • the UE-specific reference signal may be mapped to an RE corresponding to four symbol indexes in an even index slot, and the UE-specific reference signal may be mapped to an RE corresponding to two symbol indexes in an odd index slot. Can be mapped. In this case, the UE-specific reference signal may be mapped to an RE corresponding to four subcarrier indexes on the frequency axis.
  • the UE-specific reference signal may be mapped to an RE corresponding to three symbol indices for each slot.
  • the UE-specific reference signal may be mapped to an RE corresponding to four subcarrier indexes on the frequency axis.
  • the UE-specific reference signal may be mapped to an RE corresponding to three symbol indices for each slot on the time axis, and the UE-specific reference signal may be mapped to an RE corresponding to four subcarrier indices on a frequency axis. Can be.
  • 29A to 29H illustrate CSI-RS mapping patterns for antenna ports in a downlink subframe to which extended CP is applied except for a special subframe.
  • FIG. 29A for antenna port 15, FIG. 29B for antenna port 16, FIG. 29C for antenna port 17, FIG. 29D for antenna port 18, FIG. 29E for antenna port 19, FIG. 29F for antenna port For 20, FIG. 29G shows the CSI-RS mapping pattern for antenna port 21 and FIG. 29H for antenna port 22, respectively.
  • the CSI-RS may be mapped to an RE corresponding to one symbol index for each slot.
  • the present invention has proposed mapping patterns for the CSI-RS in addition to the UE-specific reference signal, but is not limited thereto.
  • each component or feature is to be considered optional unless stated otherwise.
  • Each component or feature may be embodied in a form that is not combined with other components or features. It is also possible to combine some of the components and / or features to form an embodiment of the invention.
  • the order of the operations described in the embodiments of the present invention may be changed. Some components or features of one embodiment may be included in another embodiment or may be replaced with corresponding components or features of another embodiment. It is obvious that the claims may be combined to form an embodiment by combining claims that do not have an explicit citation relationship in the claims or as new claims by post-application correction.
  • a method for transmitting and receiving a terminal-specific reference signal and an apparatus therefor are available industrially in various communication systems such as 3GPP LTE, LTE-A, and IEEE 802.

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Abstract

L'invention concerne un procédé pour émettre et recevoir un signal de référence propre à l'équipement utilisateur et un appareil correspondant. Un procédé pour une station de base émettant un signal de référence propre à l'équipement utilisateur dans un système de communication sans fil selon un mode de réalisation de l'invention comprend une étape dans laquelle la station de base émet le signal de référence propre à l'équipement utilisateur au moyen d'un motif prédéterminé, le motif prédéterminé pouvant être un motif mappé sur un RE, l'indice de référence propre à l'équipement utilisateur étant un indice comprenant les indices symboliques 0, 3, et 6 à partir d'un créneau d'indices constitué de nombres pairs dans un bloc de ressources (RB) ou mappé sur un RE dans lequel l'indice de référence propre à l'équipement utilisateur est un indice comprenant les indices symboliques 2 et 5 à partir d'un créneau d'indices constitué de nombres impairs à l'intérieur du bloc de ressources (RB).
PCT/KR2012/007268 2011-09-09 2012-09-10 Procédé pour émettre et recevoir un signal de référence propre à l'équipement utilisateur et appareil correspondant WO2013036090A1 (fr)

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US14/342,702 US9344247B2 (en) 2011-09-09 2012-09-10 Method for transmitting and receiving UE-specific reference signal and apparatus for same
KR1020147004156A KR20140065392A (ko) 2011-09-09 2012-09-10 단말-특정 참조신호를 전송 및 수신하는 방법과 이를 위한 장치

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US9344247B2 (en) 2016-05-17
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